We are a UK distributor of TFA - The Flavor Apprentice concentrates made in USA. TFA is a division of famous TPA - The Perfumers Apprentice company which produces various ranges of flavour concentrates for different uses from 2004. This brand has gained a lot of trust among vapers around the world, who blend their DIY e liquids with The Flavour Apprentice concentrates. These concentrates can be usually used at about 5-15% in your e-liquid base, but each flavour has different intensity so we will provide recommended percentage of use for each of the flavours. TFA flavour concentrates are food safe and they can also be used for baking, candy or soda lemonade making and a lot of other applications. Bulk sizes available.